For performance reasons, Firefox currently doesn't use the cross-platform fdlibm for Math.cos, Math.sin, and Math.tan (using it only for other, more esoteric functions like Math.cosh and Math.sinh), and instead chooses to use the local, platform-supplied math library [0]. This leaves Firefox open to math-based fingerprinting [1]. Using fdlibm for these more popular functions closes this fingerprinting vector.
